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Improved performance of perovskite light-emitting diodes with a NaCl doped PEDOT: PSS hole transport layer

We demonstrate a simple and effective way to enhance the performance of perovskite light-emitting diodes (PeLEDs) by utilizing an alkali halide doped PEDOT:PSS as the hole transport layer (HTL). The alkali halide (NaCl) doping helped the growth of the quasi-2D perovskite phases on top of the PEDOT:P...

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Main Authors: Huang, Xiaokun (Author) , Bäuerle, Rainer (Author) , Scherz, Felix (Author) , Tisserant, Jean-Nicolas (Author) , Kowalsky, Wolfgang (Author) , Lovrinčić, Robert (Author) , Hernandez-Sosa, Gerardo (Author)
Format: Article (Journal)
Language:English
Published: 09 Mar 2021
In: Journal of materials chemistry. C, Materials for optical and electronic devices
Year: 2021, Volume: 9, Issue: 12, Pages: 4344-4350
ISSN:2050-7534
DOI:10.1039/D0TC06058E
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1039/D0TC06058E
Verlag, lizenzpflichtig, Volltext: https://pubs.rsc.org/en/content/articlelanding/2021/tc/d0tc06058e
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Author Notes:Xiaokun Huang, Rainer Bäuerle, Felix Scherz, Jean-Nicolas Tisserant, Wolfgang Kowalsky, Robert Lovrinčić and Gerardo Hernandez-Sosa
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Summary:We demonstrate a simple and effective way to enhance the performance of perovskite light-emitting diodes (PeLEDs) by utilizing an alkali halide doped PEDOT:PSS as the hole transport layer (HTL). The alkali halide (NaCl) doping helped the growth of the quasi-2D perovskite phases on top of the PEDOT:PSS, it also significantly reduced the exciton quenching in PEDOT:PSS based PeLEDs. More importantly, the doping reduced the work function of the PEDOT:PSS surface, which appropriately modulated the hole injection leading to improved charge balance. This helps to control the recombination zone inside the thin perovskite emitting layer (∼10 nm). The optimized blue-green PeLEDs with the NaCl doped PEDOT:PSS HTL showed a maximum luminance of 1487 cd m−2, current efficiency of 2.16 cd A−1 with a low turn-on voltage of 3.0 V, which are 217% and 567% higher than the PeLEDs with the pristine PEDOT:PSS layer (turn-on voltage: 3.3 V), respectively.
Item Description:Gesehen am 02.06.2021
Physical Description:Online Resource
ISSN:2050-7534
DOI:10.1039/D0TC06058E

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